Users Manual Chapter 5

Thor VM3A Vehicle-Mounted Computer 83
10-60 VDC Direct Power Connection
1. The Thor VM3A must not be mounted in the dock. The power switch on the dock
must be turned Off. The power cable must be UNPLUGGED from the dock.
2. While observing the Fuse Requirements for 10-60 VDC Direct Connection,
connect the power cable as close as possible to the actual battery terminals of
the vehicle (if using unswitched power).
3. Use proper electrical and mechanical fastening means for terminating the
cable. Properly sized “crimp” type electrical terminals are an accepted method
of termination. Please select electrical connectors sized for use with 20AWG
(0.81mm
2
) conductors.
4. Refer to the wiring diagrams following this section for wire colors and
connections:
• Ignition Control Wiring Diagram for 10-60 VDC Direct Power
• Auto-On Control Wiring Diagram for 10-60 VDC Direct Connection
• Manual On/Off Control Wiring Diagram for 10-60 VDC Direct Connection
5. Route the power cable the shortest way possible removing any left-over cable.
The cable is rated for a maximum temperature of 105°C (221°F). Therefore,
when routing this cable it should be protected from physical damage and from
surfaces that might exceed this temperature. Cable should be protected from
physical damage from moving parts. Do not expose the cable to chemicals or
oil that may cause the wiring insulation to deteriorate. Always route the cable so
that it does not interfere with safe operation and maintenance of the vehicle.
6. Provide mechanical support for the cable by securing it to the vehicle structure
at approximately one foot intervals, taking care not to over tighten and pinch
conductors or penetrate outer cable jacket.
7. Connect the watertight connector end of the power cable to the dock power
connector by aligning the connector pins to the power connector; push down
on the watertight connector and twist it to fasten securely.
8. Secure the power cable to the computer using the Strain Relief Cable Clamps.
9. Place Thor VM3A in the Dock
10. If using the Screen Blanking Installation feature, install the screen blanking box
or switch.
11. Power On the Computer.
Once installation is complete, remember to start the computer and configure the
Power Mode.
See the Auto-On control panel.
Ignition Control Wiring Diagram for 10-60 VDC Direct Power
Ignition wire must be connected and Ignition Control must be selected on the
Power Mode control panel. When switched vehicle power is available the Thor
VM3A ignition signal wire can be connected (less than 1mA over input voltage